. Research methods in ecology. Plant ecology. QUADRATS 171 a labeled stake at one corner of the quadrat, and locating the latter definitely in relation to a conspicuous landmark. When one is in residence for several years, practically all chart quadrats are converted into permanent ones, since the work already done in the chart quadrat is so much accomplished towards the permanent one. This is not necessary when one wishes merely to com- pare different areas of stable formations. As a rule, however, some change is constantly being wrought by invasion or competition, and the amount and directio
. Research methods in ecology. Plant ecology. QUADRATS 171 a labeled stake at one corner of the quadrat, and locating the latter definitely in relation to a conspicuous landmark. When one is in residence for several years, practically all chart quadrats are converted into permanent ones, since the work already done in the chart quadrat is so much accomplished towards the permanent one. This is not necessary when one wishes merely to com- pare different areas of stable formations. As a rule, however, some change is constantly being wrought by invasion or competition, and the amount and direction of this can only be revealed by the permanent quadrat. The latter- has a fundamental value for all kinds of invasion, but it is absolutely indis-. Fig. 53. Permanent quadrat, Polygonile (Polygonum histortoides) Ruxton Park; mapped and photographed July 32, denuded September 8, 1903. pensable in studying complete invasion or succession, and in discovering and recording the gradual effects of competition. It is in the detailed investiga- tion of these dynamic phenomena that the paramount importance of the quadrat is most evident. If the experience of several years be taken as con- clusive, no other method is capable of revealing the minute changes as they are occurring. The permanent quadrat is regularly i meter square, a size determined both by the exigencies of charting and photographing. When ecograph batteries are used, the quadrat is located as close to the latter as is possible. Other-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clements, Frederic E. (Frederic Edward), 1874-1945. Lincoln, Neb. , University Pub. Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantec, bookyear1905
